My Ex Is the Tenth Vongola Boss?!

Amemiya Mari, known as Molly Phoenix, is a silver-haired woman of Italian-Japanese heritage who has spent years struggling as an office worker in Tokyo. Despite her noble lineage, she lives in obscurity, bullied by a lecherous boss tied to a local Mafia. After her father’s death and the decline of her family, she faces harassment and professional stagnation. On October 13th, after a client rejects her work for the twentieth time, she discovers her boss has prepared a trap in the break room. Cornered and绝望, Mari retrieves her father’s revolver, planning to kill him and then herself to avoid capture. However, a phone call from William, the butler of her grandfather, interrupts her. William reveals that she is the heir to the Italian Phoenix family and that he has disabled the building’s surveillance. Mari chooses to castrate her boss rather than kill him, ensuring he can never harm others while avoiding immediate Mafia retaliation. She then flees to Italy to inherit her family’s legacy.

Upon arriving in Sicily, Molly attends the birthday banquet of the Tenth Vongola Boss, an allied Mafia family. There, she encounters Tsunayoshi Sawada, her ex-boyfriend from ten years ago. In their youth, Tsuna was a timid, bullied student who ranked last in his class, while Molly was a proud, sharp-tongued noble girl. She had used him as a follower and dated him briefly before abruptly ending things and leaving Japan without explanation. Now, Tsuna is the powerful, respected leader of the most influential Mafia in Italy. The reversal of their social statuses humiliates Molly, who feels she has fallen from grace. When Tsuna recognizes her, she attempts to flee, but he intercepts her. Their confrontation is charged with unresolved tension and old grievances. Molly lies about having a new boyfriend to provoke him, and Tsuna reveals he is also engaged, setting the stage for a bitter, competitive dynamic between them.

Later that night, Molly is drugged by a maid working for a rival faction. The drug causes her to lose control, and she initiates a sexual encounter with Tsuna, who is also targeted by the same poison. The next morning, Molly wakes up in Tsuna’s arms, horrified by the situation. Fearing that Tsuna, now a powerful boss with a fiancée, will silence her to protect his reputation, she pretends to have amnesia. Tsuna sees through her act but plays along, though his demeanor suggests he still harbors deep feelings for her. Molly discovers that Tsuna kept the safety charm she gave him ten years ago, indicating she has not forgotten him either. Overwhelmed by shame and conflicting emotions, she escapes through a window, leaving the charm behind with a note rejecting their past.

Back at the Phoenix estate, Molly falls severely ill with a fever, refusing to show weakness to her new subordinates. Tsuna, concerned that she is hiding her illness, sneaks into her room at night. He finds her burning with fever and tends to her, cooling her down and administering medicine. During her delirium, Molly hallucinates that he is her past self’s caretaker, clinging to him and begging him not to leave. Tsuna kisses her in her sleep, but she wakes enough to reject the intimacy, stating that kissing is reserved for lovers. The next morning, Molly believes the entire night was a fever dream, especially since her bruises have vanished due to the healing properties of the Vongola ointment Tsuna used. However, William informs her that Tsuna is the executor of her grandfather’s will and will preside over her official inheritance ceremony. The story concludes with Molly beginning her training under Lal Mirch, a legendary Vongola guardian, as she navigates her new role as family head while dealing with her complicated history with the Vongola Boss.